How much does a 3.00 to 4.99ct I I1 lab grown round diamond cost?

As of September 2026, 3.00 to 4.99ct I I1 lab grown round diamonds typically cost $14,678 AUD to $55,224 AUD, with a median price of $30,527 AUD. There are currently 30 diamonds matching this specification available across retailers.

Where can I find the best price on a I I1 round diamond?

About 15% of these diamonds are available at multiple retailers, with an average price spread of 77%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct I I1 Lab Grown Round

Quick answer

As of September 2026, there are 30 lab grown round diamonds with I colour and I1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $14,678 AUD to $55,224 AUD, with a median of $30,527 AUD. At least 9 retailers stock this exact specification, and 15% of the stones appear at more than one of them, with an average price spread of 77%. Half of all listings fall between $4,274 AUD and $8,993 AUD per carat. The same specification in natural form lists at a median of about $13,357 AUD per carat. Over the last 30 days the median price moved -32.4% and the number of listings moved -64.1%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Round lab grown stones in the index: 438 USD per carat, -14.1% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

Lowest Price

$12,815 AUD

Highest Price

$74,991 AUD

Average Price

$30,947 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

14.7%

Price Spread

77.3%

30-Day Price Trend

-32.4%

30-Day Supply Change

-64.1%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$4,377/ct

10th Percentile

$2,855

Median

$4,377

90th Percentile

$9,770

Score Distribution

30 diamonds scored across 3 quality tiers

Very Good

9 (30.0%)

Good

8 (26.7%)

Average

13 (43.3%)

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Related Specifications

D IF D VVS1 D VVS2 D VS1 D VS2 D SI1 E IF E VVS1 E VVS2 E VS1 E VS2 E SI1 F IF F VVS1 F VVS2 F VS1 F VS2 F SI1 G IF G VVS1 G VVS2 G VS1 G VS2 G SI1 H IF H VVS1 H VVS2 H VS1 H VS2 H SI1 I IF I VVS1 I VVS2 I VS1 I VS2 I SI1